Re: [PATCH] mm: mm, mmap: do not blow on PROT_NONE MAP_FIXED holes in the stack

From: Michal Hocko
Date: Wed Jul 05 2017 - 14:29:01 EST

On Wed 05-07-17 10:43:27, Linus Torvalds wrote:
> On Wed, Jul 5, 2017 at 9:56 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> >
> > "mm: enlarge stack guard gap" has introduced a regression in some rust
> > and Java environments which are trying to implement their own stack
> > guard page. They are punching a new MAP_FIXED mapping inside the
> > existing stack Vma.
> Hmm. What version is this patch against? It doesn't seem to match my 4.12 tree.

Dohh, that was on mmotm which has a clean up by Oleg which reorganizes
the code a bit. This is on top of the current master